JP2017058042A - Heat exchange type ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange type ventilation device that has high reliability even when a filter for air-supply wind channel is clogged, and is capable of switching wind channels for heat exchange ventilation and ordinary ventilation by a damper.SOLUTION: The heat exchange type ventilation device includes: a first exhaust wind channel 14 and a second exhaust wind channel 15 in an exhaust wind channel 8; and a damper for switching these wind channels so as to switch the damper with high reliability when the filter 16 is clogged. The heat exchange type ventilation device also includes control means 19 for stopping energization to an air-supply motor 11 and an exhaust motor 12 before switching the damper.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange type ventilation apparatus capable of performing heat exchange ventilation and normal ventilation with a single main body.

  Conventionally, as shown in the schematic diagram of FIG. 4, this type of heat exchange type ventilator has a supply air passage 102 for supplying outdoor air to the main body 101 and a first exhaust for exhausting indoor air to the outside. An air passage 103; a second exhaust air passage 104 that exhausts indoor air to the outside; a damper 105 that switches between the first exhaust air passage 103 and the second exhaust air passage 104; an air supply air passage 102 and a first exhaust air A heat exchange element 106 that exchanges heat with the passage 103, an air supply fan 107 that generates a supply airflow passing through the supply air passage 102, and the first exhaust air passage 103 and / or the second exhaust air passage 104. There is known a heat exchange type ventilator including an exhaust fan 108 that generates an exhaust flow, an indoor temperature and humidity sensor 109 that detects indoor temperature and humidity, and an outdoor temperature and humidity sensor 110 that detects outdoor temperature and humidity.

  The conventional heat exchange ventilator controls the damper 105 so as to switch to the exhaust air path that does not cause discomfort to the user from the temperature and humidity detected by the indoor temperature and humidity sensor 109 and the outdoor temperature and humidity sensor 110. Yes. (For example, refer to Patent Document 1).

JP-A-2015-102282

  In such a conventional heat exchange type ventilator, the exhaust fan 108 is operated when the damper 105 is switched so that the torque of the stepping motor that drives the damper 105 by the exhaust flow is insufficient and the exhaust air path is not switched normally. Although it was stopped, the operation of the air supply fan 107 was continued in consideration of the 24-hour ventilation according to the Building Standard Law.

  However, when a filter that removes dust from the air passing through the supply air passage 102 is installed upstream of the heat exchange element 106 in the supply air passage 102, when the filter is clogged with dust, the suction of the supply air passage 102 The mouth is closed, and the air supply air passage 102 becomes negative pressure by the air supply fan 107.

  In the above situation, when only the exhaust fan 108 is stopped when the damper 105 is switched, the following problem occurs. That is, the heat exchange element 106 has an internal leak (air leak) between the first exhaust air passage 103 and the air supply air passage 102 due to its structure. For this reason, when the filter is clogged, an unintended air flow is generated from the suction port of the first exhaust air passage 103 toward the exhaust port of the supply air passage 102 through the heat exchange element 106.

  As a result, when switching from the second exhaust air passage 104 to the first exhaust air passage 103, there is a problem that the torque of the stepping motor that drives the damper 105 is insufficient due to the air flow and the air passage is not normally switched. Alternatively, when switching from the first exhaust air passage 103 to the first exhaust air passage 104, there is a problem that the damper 105 is pulled by the air flow and stress is generated on the shaft of the stepping motor.

  The present invention provides a heat exchange type ventilator that solves the above-mentioned problems and that can switch between a heat exchange ventilator and a normal ventilator with a damper with high reliability even when a filter of a supply air duct is clogged. The purpose is to do.

  In order to achieve this object, a heat exchange type ventilator according to the present invention includes an air supply air passage for supplying outdoor air into the room, and a first exhaust air passage for exhausting the indoor air to the outside. A second exhaust air passage that exhausts the indoor air to the outside, a damper that switches between the first exhaust air passage and the second exhaust air passage, and a supply air that generates a supply air flow that passes through the air supply air passage. Between the air flow generation means, the exhaust flow generation means for generating an exhaust flow passing through the first exhaust air passage and / or the second exhaust air passage, and the exhaust air flow passing through the supply air flow and the first exhaust air passage A heat exchange type ventilator including a heat exchange element for exchanging heat in the filter, the filter removing dust in the air passing through the supply air path upstream of the heat exchange element in the supply air path; Before the damper switches between the first exhaust air passage and the second exhaust air passage. It is intended and a control means for stopping the supply airflow generating means and the exhaust flow generating means, thereby is to achieve the intended purpose.

  ADVANTAGE OF THE INVENTION According to this invention, even when the filter of a supply air path is clogged, the heat exchange type | mold ventilation apparatus which can switch the air path of heat exchange ventilation and normal ventilation with a damper highly reliable can be provided.

The structure schematic diagram of the heat exchange type | formula ventilation apparatus which concerns on Embodiment 1 of this invention. 1 is a schematic air path diagram of a heat exchange type ventilator according to Embodiment 1 of the present invention. The damper control flowchart of the heat exchange type ventilator which concerns on Embodiment 1 of this invention. The schematic block diagram of a prior art.

  The heat exchange type ventilator according to the present invention includes an air supply passage for supplying outdoor air into the room, a first exhaust air passage for exhausting the indoor air to the outside, and the indoor air to the outside. A second exhaust air passage for exhausting, a damper for switching between the first exhaust air passage and the second exhaust air passage, a supply air flow generating means for generating a supply air flow passing through the supply air passage, and the first exhaust air An exhaust flow generating means for generating an exhaust flow passing through the passage and / or the second exhaust air passage, and a heat exchange element for exchanging heat between the supply air flow and the exhaust flow passing through the first exhaust air passage. A heat exchange type ventilator, wherein the filter removes dust from the air passing through the supply air path upstream of the heat exchange element in the supply air path, and the damper includes the first exhaust air path. And the air flow generating means and the exhaust flow generating means It is obtained by a control means for stopping and.

  As a result, when the filter is clogged with dust, even if a supply air flow is generated from the first exhaust air passage toward the supply air passage due to internal leakage of the heat exchange element, the load due to the supply air flow is changed to the damper when the damper is switched. Because it does not take, it is highly reliable and the air path between heat exchange ventilation and normal ventilation can be switched with a damper.

  Further, the control means switches the damper after a stop time required for the supply air flow generation means and the exhaust flow generation means to stop after the supply air flow generation means and the exhaust flow generation means are stopped. You may do it.

  Thereby, after stopping the said air supply flow generation means and the said exhaust flow generation means, a damper can be switched after an air supply flow stops reliably. Therefore, it is possible to suppress the supply airflow generated by the inertia of the supply airflow generation means from applying a load to the damper.

  The damper includes a stepping motor for rotating the opening / closing door, and the control means drives the stepping motor with the number of steps necessary to rotate the stepping motor by a predetermined angle after the stop time has elapsed. May be transmitted to switch the damper, and then the operation of the supply air flow generation means and the exhaust flow generation means may be resumed.

  Thereby, after damper switching is completed reliably, the operation | movement of the said air supply flow generation means and the said exhaust flow generation means can be restarted. That is, it is possible to suppress a load on the damper due to restarting the operation of the supply air flow generation unit and the exhaust flow generation unit during the damper switching.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention. In addition, throughout the drawings, the same portions are denoted by the same reference numerals, and the second and subsequent descriptions are omitted. Furthermore, in each drawing, the description of the details of each part not directly related to the present invention is omitted.

(Embodiment 1)
The heat exchanging ventilator 1 according to Embodiment 1 of the present invention is installed behind a ceiling in a building, in a side wall, or under the floor. Hereinafter, a case where it is installed under the floor will be described.

  FIG. 1 shows the configuration of the heat exchange type ventilator 1. The heat exchanging ventilator 1 has a rectangular parallelepiped shape, and has an outdoor suction port 3 for sucking outdoor air on one side surface 2 (left side in FIG. 1), and an outdoor exhaust port 4 for discharging indoor air to the outside. have.

  The opposing surface of the side surface 2 has an indoor exhaust port 5 for sucking indoor air and an indoor air supply port 6 for supplying air into the room.

  The heat exchanging ventilator 1 includes an air supply air passage 7 that communicates with the outdoor air inlet 3 and the indoor air intake port 6, and an exhaust air air passage 8 that communicates the indoor air outlet 5 and the outdoor air outlet 4. Yes. In addition, although the exhaust air path 8 is comprised from the 1st exhaust air path 14 and the 2nd exhaust air path 15, the detail is mentioned later.

  The heat exchanging ventilator 1 is provided with a sirocco-type air supply fan 9 as a supply air flow generation means in the supply air passage 7 and a sirocco-type exhaust fan 10 as an exhaust flow generation means in the exhaust air passage 8.

  The air supply fan 9 is connected to an air supply motor 11, and the exhaust fan 10 is connected to an exhaust motor 12, and an air flow is generated in the air passage by rotational driving of the fan.

  A heat exchange element 13 for exchanging heat of indoor air and outdoor air is disposed at a position where the supply air passage 7 and the first exhaust air passage 14 constituting the exhaust air passage 8 intersect.

  The heat exchange element 13 has a function of collecting exhaust heat from the room and supplying it to the supply air from the outside. Although the air paths intersecting in the heat exchange element 13 are independent from each other, each air path is formed by bonding a plurality of thin plates having an air supply air path on the front surface and an exhaust air path on the back surface by adhesion. . That is, since the air path is blocked by the adhesive, an internal leak of 2 to 3%, that is, an air leak occurs.

  A filter 16 for removing dust from the air passing through the air supply air passage 7 is provided upstream of the heat exchange element 13 in the air supply air passage 7. In FIG. 1, the filter 16 is disposed inside the main body, but may be disposed in a duct (not shown) outside the main body as long as it is within the supply air path 7.

  The exhaust air passage 8 includes the first exhaust air passage 14 communicating from the indoor exhaust port 5 shown in FIG. 2A to the outdoor exhaust port 4 via the heat exchange element 13. Further, the exhaust air passage 8 further communicates with the outdoor exhaust port 4 from the indoor exhaust port 5 shown in FIG. 2B without passing through the heat exchange element 13, that is, without being subjected to heat exchange processing. A path 15 is provided. A damper 17 for switching between the first exhaust air passage 14 and the second exhaust air passage 15 is provided in the exhaust air passage 8.

The damper 17 is connected to the electric motor 18 and switches between the first exhaust air passage 14 and the second exhaust air passage 15. Here, the electric motor 18 may be a stepping motor driven by a DC voltage.
The damper 17 is rotationally driven around the electric motor 18 to shield the entrance to the heat exchange element 13 in the first exhaust air passage, or to shield the second exhaust air passage from the first exhaust air passage 14. The second exhaust air passage 15 is switched.

  Moreover, the heat exchange type ventilation apparatus 1 is provided with the control means 19, the 1st memory | storage means 20, and the 2nd memory | storage means 21 as shown in FIG.

  The control means 19 controls the presence / absence of energization of the air supply motor 11 and the exhaust motor 12 and the position of the damper 17 according to conditions. The control conditions will be described later.

  The first storage means 20 stores a threshold value for comparison with the time count after the energization of the air supply motor 11 and the exhaust motor 12 is stopped.

  The control means 19 starts time counting after the energization of the air supply motor 11 and the exhaust motor 12 is stopped, and compares with the threshold value stored in the first storage means 20, and if they match, the air supply fan 9 and the exhaust fan 10 is determined to be stopped. For example, the time until it is determined that the rotation of the air supply fan 9 and the exhaust fan 10 is completely stopped is the time until the rotation due to inertia is sufficiently stopped even when the fan stops at high rotation. Is preferably about 10 seconds. Further, when there is a difference in performance between the supply motor 11 and the exhaust motor 12, a time during which both the motors can be sufficiently stopped is set as a threshold value.

  The second storage means 21 stores the number of steps until the stepping motor that is the electric motor 18 completes switching between the first exhaust air passage 14 and the second exhaust air passage 15.

  The control means 19 starts counting the number of steps from the start of transmitting the drive command to the stepping motor, compares it with the number of steps stored in the second storage means 21, and if they match, the first exhaust air passage 14 and the second exhaust It is determined that the switching with the air passage 15 is completed. For example, when the damper angle between the first exhaust air passage and the second exhaust air passage is 150 °, it can be determined that the switching has been completed if the operation is performed 160 ° including the 10 ° additional tightening so as to be surely closed. When a stepping motor having a step number of 0.706 ° is used, it is determined that the switching is completed when the number of steps is 227.

  Next, whether or not the air supply motor 11 and the exhaust motor 12 are energized by the control means 19 and the switching of the damper 17 will be described with reference to the flowchart shown in FIG. In addition, S in FIG. 3 means a step.

  First, in the operation state of the heat exchanging ventilator 1, the control means 19 determines which of the first exhaust air passage 14 and the second exhaust air passage 15 is comfortable for indoor air. To do. If the judgment made here is different from the current exhaust air path, the control means 19 judges that switching of the exhaust air path is necessary, and if the judgment made matches the current exhaust air path, the exhaust air path Is determined to be unnecessary (S01).

  Whether indoor air becomes comfortable may be determined by detecting the temperature and humidity in the room and outdoors with a sensor (not shown), for example. If switching of the exhaust air path is unnecessary as a result of the determination by the control means 19, the determination as to whether switching of the exhaust air path is necessary is repeated (S01 No → S01).

  If it is determined by the control means 19 that the exhaust air path needs to be switched, the control means 19 stops energization of the air supply motor 11 and the exhaust motor 12 (S01 Yes → S02).

  After the energization of the air supply motor 11 and the exhaust motor 12 is stopped, the air supply fan 9 and the exhaust fan 10 continue to rotate due to inertia, so the control means 19 takes time until the rotation due to inertia completely stops. Wait (S03).

  After waiting for the time that the rotation of the fan is completely stopped, the control means 19 starts switching the exhaust air path using the damper 17 (S03 Yes → S04). That is, a drive command is transmitted from the control means 19 to the stepping motor, and the damper 17 is operated.

  The control means 19 is driven for the number of steps after the start of the drive command to the stepping motor until the damper 17 is switched from the first exhaust air passage to the second exhaust air passage or from the second exhaust air passage to the first exhaust air passage. The command transmission is continued, and the switching of the damper 17 is finished when the number of steps is finished (S05 Yes → S06).

  The control means 19 restarts the energization operation to the air supply motor 11 and the exhaust motor 12 that have been temporarily stopped after the switching of the damper is completed (S06).

  As a result, when the filter is clogged with dust, even if a supply air flow is generated from the first exhaust air passage toward the supply air passage due to internal leakage of the heat exchange element, the load due to the supply air flow is changed to the damper when the damper is switched. Because it does not take, it is highly reliable and the air path between heat exchange ventilation and normal ventilation can be switched with a damper.

  In addition, the control means 19 switches the damper 17 after the stop time required for stopping the air supply fan 9 and the exhaust fan 10.

  Thereby, after the fan is stopped, the damper 17 can be switched after the supply airflow is reliably stopped. Therefore, it can suppress that the airflow generated by the inertia of a fan gives a load to a damper.

  Further, a drive command of the number of steps necessary to rotate the predetermined angle to the stepping motor constituting the damper 17 is transmitted to switch the damper 17, and then the operation of the fan is resumed.

  Thereby, the operation of the fan is resumed after the damper switching is completed. That is, it is possible to suppress a load on the damper 17 caused by restarting the fan operation during the damper switching.

  The ventilation device according to the present invention performs heat exchange ventilation and normal ventilation with one main body, and is highly reliable even when the filter of the supply air path is clogged, and switches between the air path of heat exchange ventilation and normal ventilation with a damper. Yes, it is useful for heat exchange type ventilation equipment used in ordinary houses.

DESCRIPTION OF SYMBOLS 1 Heat exchange type ventilator 2 Side surface 3 Outdoor suction port 4 Outdoor exhaust port 5 Indoor exhaust port 6 Indoor air supply port 7 Air supply air channel 8 Exhaust air channel 9 Supply air fan 10 Exhaust fan 11 Supply motor 12 Exhaust motor 13 Heat exchange Element 14 First exhaust air passage 15 Second exhaust air passage 16 Filter 17 Damper 18 Electric motor 19 Control means 20 First storage means 21 Second storage means

Claims (3)

An air supply passage for supplying outdoor air into the room;
A first exhaust air passage for exhausting the indoor air to the outside;
A second exhaust air passage for exhausting the indoor air to the outside;
A damper for switching between the first exhaust air passage and the second exhaust air passage;
A supply air flow generating means for generating a supply air flow passing through the supply air flow path;
Exhaust flow generating means for generating an exhaust flow passing through the first exhaust air path and / or the second exhaust air path;
A heat exchange type ventilator comprising a heat exchange element for exchanging heat between the air supply flow and the exhaust flow passing through the first exhaust air passage,
A filter that removes dust from the air passing through the supply air path on the upstream side of the heat exchange element in the supply air path;
A heat exchange type ventilator comprising control means for stopping the supply air flow generation means and the exhaust flow generation means before the damper switches between the first exhaust air path and the second exhaust air path. The control means includes
2. The heat exchange according to claim 1, wherein after stopping the supply air flow generation unit and the exhaust flow generation unit, the damper is switched after a stop time required for the supply air flow generation unit and the exhaust flow generation unit to stop. Type ventilator. The damper includes a stepping motor that rotates the door.
The control means includes
After the stop time has elapsed,
A drive command of the number of steps necessary to rotate the stepping motor by a predetermined angle is transmitted to the stepping motor to switch the damper, and then the operation of the supply air flow generation means and the exhaust flow generation means is resumed. The heat exchange type ventilator according to claim 1.

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